OpenCV车辆追踪学习笔记

// FrameDiff.cpp : 定义控制台应用程序的入口点。
//

#include"stdafx.h"
#include
using namespace std;
#include
#include
#include
using namespace cv;

const unsigned char FORE_GROUD = 127;
int thresh = 15;

int main(int argc, char*argv[])
{
	VideoCapture video("D:/文档/研究生/研二/交通行为参数提取/数据/交叉口视频/test1.avi");

	//判断如果video是否可以打开
	if (!video.isOpened())
		return -1;

	//用于保存当前帧的图片
	Mat currentBGRFrame;

	//用来保存上一帧和当前帧的灰度图片
	Mat previousGrayFrame;
	Mat currentGaryFrame;

	//用来保存帧差
	Mat frameDifference;//CV_16SC1

	//用来保存帧差的绝对值
	Mat absFrameDifferece;

	//用来显示前景
	Mat segmentation;

	//显示原视频
	namedWindow("原视频", 0);

	//显示前景
	namedWindow("二值化", 0);
	cvResizeWindow("二值化", 500, 500);
	createTrackbar("阈值:", "二值化", &thresh, FORE_GROUD, NULL);

	//帧数
	int numberFrame = 0;

	//形态学处理用到的算子
	Mat morphologyKernel = getStructuringElement(MORPH_RECT, Size(3, 3), Point(-1, -1));

	for (;;)
	{
		//读取当前帧
		video >> currentBGRFrame;

		//判断当前帧是否存在
		if (!currentBGRFrame.data)
			break;

		numberFrame++;

		if (numberFrame == 1)
		{
			//颜色空间的转换
			cvtColor(currentBGRFrame, currentGaryFrame, COLOR_BGR2GRAY);
			//保存当前帧的灰度图
			previousGrayFrame = currentGaryFrame.clone();
			imshow("原视频", currentBGRFrame);
			continue;
		}
		else
		{
			//颜色空间的转换
			cvtColor(currentBGRFrame, currentGaryFrame, COLOR_BGR2GRAY);

			//src1-src2
			subtract(currentGaryFrame, previousGrayFrame, frameDifference, Mat(), CV_16SC1);

			//取绝对值
			absFrameDifferece = abs(frameDifference);

			//位深的改变
			absFrameDifferece.convertTo(absFrameDifferece, CV_8UC1, 1, 0);

			//阈值处理
			threshold(absFrameDifferece, segmentation, double(thresh), double(FORE_GROUD), THRESH_BINARY);

			//中值滤波
			medianBlur(segmentation, segmentation, 3);

			//形态学处理(开闭运算)
			morphologyEx(segmentation,segmentation,MORPH_OPEN,morphologyKernel,Point(-1,-1),1,BORDER_REPLICATE);
			morphologyEx(segmentation, segmentation, MORPH_CLOSE, morphologyKernel, Point(-1, -1), 2, BORDER_REPLICATE);

			//显示二值化图片
			imshow("二值化", segmentation);

			//找边界
			vector< vector > contours;	//contours定义为2维浮点向量
			vector hierarchy;	//定义的层级
			findContours(segmentation, contours, hierarchy, CV_RETR_EXTERNAL, CV_CHAIN_APPROX_SIMPLE, Point(0, 0)); //CV_RETR_TREE
			vector< vector > contours_poly(contours.size());

			/*存储运动物体*/
			vector boundRect;
			boundRect.clear();

			//画出运动物体
			//对视频中出现的运动物体，进行初次的筛选
			for (int index = 0; index < contours.size(); index++)
			{
				approxPolyDP(Mat(contours[index]), contours_poly[index], 3, true);
				Rect rect = boundingRect(Mat(contours_poly[index]));
				if (rect.area() > 400)
					rectangle(currentBGRFrame, rect, Scalar(0, 255, 255), 2);
			}

			//显示原视频
			namedWindow("原视频", 1); 
			imshow("原视频", currentBGRFrame);

			//保存当前帧的灰度图
			previousGrayFrame = currentGaryFrame.clone();
		}

		if (waitKey(33) == 'q')
			break;

	}
	return 0;
}